Management of certificates for mobile devices

ABSTRACT

One embodiment of the present disclosure provides a method that includes accessing, by a mobile device management system, a profile for a mobile device. The method also includes negotiating, by the mobile device management system, with a certificate authority to obtain a certificate for the mobile device. The negotiating with the certificate authority includes imitating the mobile device based on the profile. The negotiating with the certificate authority also includes, based at least on the imitation, transmitting one or more certificate enrollment messages to the certificate authority. The negotiating with the certificate authority further includes, based on the one or more messages, receiving, at the mobile device management system, the certificate for the mobile device. The method further includes transmitting the certificate to a control agent hosted on the mobile device for installation.

CROSS REFERENCE TO OTHER APPLICATIONS

This application is a continuation of co-pending U.S. patent applicationSer. No. 13/916,507, entitled MANAGEMENT OF CERTIFICATES FOR MOBILEDEVICES, filed Jun. 12, 2013, which is a continuation of U.S. patentapplication Ser. No. 12/976,402, now U.S. Pat. No. 8,494,485, entitledMANAGEMENT OF CERTIFICATES FOR MOBILE DEVICES, filed Dec. 22, 2010, bothof which are incorporated herein by reference for all purposes.

TECHNICAL FIELD

This disclosure relates generally to mobile devices and managementsystems and, more particularly, to managing certificates for mobiledevices.

BACKGROUND OF THE INVENTION

In a manner similar to personal computers and laptops, businessenterprises increasingly rely on mobile and handheld devices. Indeed,the capabilities and uses of mobile devices have moved beyond voicecommunications and personal information management applications to avariety of communications- and business-related functions includingemail, browsing, instant messaging, enterprise applications, and videoapplications. For example, the functionality of many mobile devices havebeen extended to include cellular and wireless local area network (WLAN)communications interfaces, as well as virtual private network (VPN) andother client applications. Furthermore, mobile devices used inenterprises may also include enterprise applications used by employeesin the field or otherwise.

Deployment, management and configuration of mobile and handheld devicesin enterprise environments, however, present certain challenges. Forexample, the vast and constantly changing variety of mobile devicetypes, functions and capabilities presents challenges to configuration,provisioning and troubleshooting. Moreover, the number and variety ofapplications that can be installed on mobile devices, as well as thenature of the mobile devices themselves, challenges networkadministrators relative to network security, deployment and overallmanagement.

BRIEF DESCRIPTION OF THE DRAWINGS

Various embodiments of the invention are disclosed in the followingdetailed description and the accompanying drawings.

FIG. 1 illustrates an example mobile device management architectureaccording to an embodiment of the present disclosure.

FIG. 2 is a schematic diagram illustrating an example server systemarchitecture.

FIG. 3 is a schematic diagram illustrating an example mobile devicesystem architecture.

FIG. 4 provides an example mobile device software architecture.

FIG. 5 is an example process flow for obtaining a certificate for amobile device.

DETAILED DESCRIPTION

Particular embodiments of the present disclosure provide methods,apparatuses and systems directed to managing certificates provided tomobile devices for accessing an enterprise environment. In particular, amethod includes accessing, by a mobile device management system, aprofile for a mobile device. The method also includes negotiating, bythe mobile device management system, with a certificate authority toobtain a certificate for the mobile device. The negotiating with thecertificate authority includes imitating the mobile device based on theprofile. The negotiating with the certificate authority also includes,based at least on the imitation, transmitting one or more certificateenrollment messages to the certificate authority. The negotiating withthe certificate authority further includes, based on the one or moremessages, receiving, at the mobile device management system, thecertificate for the mobile device. The method further includestransmitting the certificate to a control agent hosted on the mobiledevice for installation.

In particular embodiments, a mobile device management system obtains (byimitating the mobile device) a certificate for the mobile device from acertificate authority. This certificate may enable the mobile device toaccess various enterprise network services once the certificate isinstalled on the mobile device. The certificate, however, may only betransmitted to the mobile device if the mobile device is authorized tohave (or receive) the certificate. In this manner, a networkadministrator may control access to enterprise network services andmaintain security, while allowing the mobile device 104 to operate withapplications that access systems or hosts external to the enterprisenetwork 110, such as calling functions, and third party applications. Inone implementation, the certificate is a public key certificate, whichis an electronic document that uses a digital signature to bind togethera public key with an identity—information such as the name of a personor an organization, their address, a device identifier, and so forth.The certificate asserts that a public key belongs to an individualand/or a mobile device.

In particular embodiments, each mobile device includes a control clientapplication (hereinafter referred to as “control client”) that isconfigured to interact with the device management system and a networklink. More particularly, the control client application is configured toreceive data, commands, and other messages from the device managementsystem via a network link, to synchronize the state of the mobile devicewith the corresponding device object stored at the device managementdatabase, and to selectively track and upload data over the network linkto the device management system and database. In various embodiments,the control client logs man-machine interface (MMI) data, file systemcommands, and other data characterizing usage of, and/or the actionsperformed on, the mobile device. Some or all of the log data is providedto the device management application hosted on the device managementserver, which can synchronize a device object stored at the databasewith that of the mobile device, and vice versa.

FIG. 1 illustrates a block diagram of a computer network environment 100in accordance with an example embodiment. Computer network environment100 includes a device management system 102 and a plurality of mobiledevices 104 that may each communicate with device management system 102via one or more network links 106. In various embodiments, devicemanagement system 102 may actually comprise one or more devicemanagement servers and device management databases, one or more of whichmay or may not be physically located within the physical boundaries ofthe enterprise.

Network link(s) 106 may include any suitable number or arrangement ofinterconnected networks including both wired and wireless networks. Byway of example, a wireless communication network link over which mobiledevices 104 communicate may utilize a cellular-based communicationinfrastructure that includes cellular-based communication protocols suchas AMPS, CDMA, TDMA, GSM (Global System for Mobile communications),iDEN, GPRS, EDGE (Enhanced Data rates for GSM Evolution), UMTS(Universal Mobile Telecommunications System), WCDMA and their variants,among others. In various embodiments, network link 106 may furtherinclude, or alternately include, a variety of communication channels andnetworks such as WLAN/WiFi, WiMAX, Wide Area Networks (WANs), andBlueTooth.

As FIG. 1 illustrates, device management system 102 may be operablyconnected with (or included within) an enterprise network 110 (which mayinclude or be a part of network link(s) 106). Enterprise network 110 mayfurther include one or more of email or exchange servers 112, enterpriseapplication servers 114, certificate authority servers 116, directoryservers 118, Virtual Private Network (VPN)/SSL gateways 120, firewalls,among other servers and components. Email or exchange servers 112 mayinclude Exchange ActiveSync (EAS) or other functionality that providessynchronization of contacts, calendars, tasks, and email betweenActiveSync-enabled servers and mobile devices. Other synchronizationprotocols can also be used. The mobile devices 104 may access or utilizeone or more of these enterprise systems or associated functionality.

Example System Architectures for Management System and Mobile Devices

Device management system 102 may actually include one or more hardware,firmware, and software components residing at one or more computerservers or systems (hereinafter referred to as computer systems).Software component of device management system 102 may be at one or moreof the same computer systems. FIG. 2 illustrates an example computersystem 200. Device management system 102 may include software componentsat one or more computer systems, which may be similar to examplecomputer system 200. Particular embodiments may implement variousfunctions of device management system 102 as hardware, software, or acombination of hardware and software. As an example and not by way oflimitation, one or more computer systems may execute particular logic orsoftware to perform one or more steps of one or more processes describedor illustrated with respect to device management system 102. One or moreof the computer systems may be unitary or distributed, spanning multiplecomputer systems or multiple datacenters, where appropriate. The presentdisclosure contemplates any suitable computer system. Herein, referenceto logic may encompass software, and vice versa, where appropriate.Reference to software may encompass one or more computer programs, andvice versa, where appropriate. Reference to software may encompass data,instructions, or both, and vice versa, where appropriate. Similarly,reference to data may encompass instructions, and vice versa, whereappropriate.

One or more tangible computer-readable media may store or otherwiseembody software implementing particular embodiments. A tangiblecomputer-readable medium may be any tangible medium capable of carrying,communicating, containing, holding, maintaining, propagating, retaining,storing, transmitting, transporting, or otherwise embodying software,where appropriate. A tangible computer-readable medium may be abiological, chemical, electronic, electromagnetic, infrared, magnetic,optical, quantum, or other suitable medium or a combination of two ormore such media, where appropriate. A tangible computer-readable mediummay include one or more nanometer-scale components or otherwise embodynanometer-scale design or fabrication. Example tangible, non-transitorycomputer-readable media include, but are not limited to,application-specific integrated circuits (ASICs), compact discs (CDs),field-programmable gate arrays (FPGAs), floppy disks, floptical disks,hard disks, holographic storage devices, magnetic tape, caches,programmable logic devices (PLDs), random-access memory (RAM) devices,read-only memory (ROM) devices, semiconductor memory devices, and othersuitable computer-readable media.

Software implementing particular embodiments may be written in anysuitable programming language (which may be procedural or objectoriented) or combination of programming languages, where appropriate.Any suitable type of computer system (such as a single- ormultiple-processor computer system) or systems may execute softwareimplementing particular embodiments, where appropriate. Ageneral-purpose or specific-purpose computer system may execute softwareimplementing particular embodiments, where appropriate.

The components in FIG. 2 are examples only and do not limit the scope ofuse or functionality of any hardware, software, embedded logiccomponent, or a combination of two or more such components implementingparticular embodiments. Computer system 200 may have any suitablephysical form, including but not limited to one or more integratedcircuits (ICs), printed circuit boards (PCBs), mobile handheld devices(such as mobile telephones or PDAs), laptop or notebook computers,distributed computer systems, computing grids, or servers. Computersystem 200 may include a display 232, one or more input devices 233(which may, for example, include a keypad, a keyboard, a mouse, astylus, etc.), one or more output devices 234, one or more storagedevices 235, and various tangible storage media 236.

Bus 240 connects a wide variety of subsystems. Herein, reference to abus may encompass one or more digital signal lines serving a commonfunction, where appropriate. Bus 240 may be any of several types of busstructures including a memory bus, a peripheral bus, or a local bususing any of a variety of bus architectures. As an example and not byway of limitation, such architectures include an Industry StandardArchitecture (ISA) bus, an Enhanced ISA (EISA) bus, a Micro ChannelArchitecture (MCA) bus, a Video Electronics Standards Association localbus (VLB), a Peripheral Component Interconnect (PCI) bus, a PCI-Express(PCI-X) bus, and an Accelerated Graphics Port (AGP) bus.

Processor(s) 201 (or central processing unit(s) (CPU(s))) optionallycontains a cache memory unit 202 for temporary local storage ofinstructions, data, or computer addresses. Processor(s) 201 are coupledto tangible storage devices including memory 203. Memory 203 may includerandom access memory (RAM) 204 and read-only memory (ROM) 205. ROM 205may act to communicate data and instructions unidirectionally toprocessor(s) 201, and RAM 704 may act to communicate data andinstructions bidirectionally with processor(s) 201. ROM 205 and RAM 204may include any suitable tangible computer-readable media describedbelow. Fixed storage 208 is connected bidirectionally to processor(s)201, optionally through storage control unit 207. Fixed storage 208provides additional data storage capacity and may also include anysuitable tangible computer-readable media described. Storage 208 may beused to store operating system 209, EXECs 210, data 211, applicationprograms 212, and the like. Typically, storage 208 is a secondarystorage medium (such as a hard disk) that is slower than primarystorage. Information in storage 208 may, in appropriate cases, beincorporated as virtual memory in memory 203.

Processor(s) 201 is connected to multiple interfaces, such as graphicscontrol 221, video interface 222, input interface 223, output interface224, storage interface 225, and storage medium interface 226. Theseinterfaces are in turn connected to appropriate devices, as may beillustrated. In general, an input/output (I/O) device may be a videodisplay, a track ball, a mouse, a keyboard, a microphone, atouch-sensitive display, a transducer card reader, a magnetic- orpaper-tape reader, a tablet, a stylus, a voice or handwritingrecognizer, a biometrics reader, another computer system, or othersuitable I/O device or a combination of two or more such I/O devices.Processor(s) 201 may connect to another computer system or totelecommunications network 230 (which may include network link 106 orenterprise network 110) through network interface 220. With networkinterface 220, CPU 201 may communicate with network 230 in the course ofperforming one or more steps of one or more processes described orillustrated herein, according to particular needs. Moreover, one or moresteps of one or more processes described or illustrated herein mayexecute solely at CPU 201. In addition or as an alternative, one or moresteps of one or more processes described or illustrated herein mayexecute at multiple CPUs 201 that are remote from each other acrossnetwork 230.

In particular embodiments, when computer system 200 is connected tonetwork 230, computer system 200 may communicate with other devices,specifically mobile devices 104 and enterprise systems, connected tonetwork 230. Communications to and from computer system 200 may be sentthrough network interface 220. For example, network interface 220 mayreceive incoming communications (such as requests or responses fromother devices) in the form of one or more packets (such as InternetProtocol (IP) packets) from network 230 and computer system 200 maystore the incoming communications in memory 203 for processing. Computersystem 200 may similarly store outgoing communications (such as requestsor responses to other devices) in the form of one or more packets inmemory 203 and communicated to network 230 from network interface 220.Processor(s) 201 may access these communication packets stored in memory203 for processing.

Computer system 200 may provide functionality as a result ofprocessor(s) 201 executing software embodied in one or more tangiblecomputer-readable storage media, such as memory 203, storage 208,storage devices 235, and/or storage medium 236. The computer-readablemedia may store software that implements particular embodiments, andprocessor(s) 201 may execute the software. Memory 203 may read thesoftware from one or more other computer-readable media (such as massstorage device(s) 235, 236) or from one or more other sources through asuitable interface, such as network interface 220. The software maycause processor(s) 201 to carry out one or more processes or one or moresteps of one or more processes described or illustrated herein. Carryingout such processes or steps may include defining data structures storedin memory 203 and modifying the data structures as directed by thesoftware. In addition or as an alternative, computer system 200 mayprovide functionality as a result of logic hardwired or otherwiseembodied in a circuit, which may operate in place of or together withsoftware to execute one or more processes or one or more steps of one ormore processes described or illustrated herein. Herein, reference tosoftware may encompass logic, and vice versa, where appropriate.Moreover, reference to a computer-readable medium may encompass acircuit (such as an IC) storing software for execution, a circuitembodying logic for execution, or both, where appropriate. The presentdisclosure encompasses any suitable combination of hardware, software,or both.

In particular embodiments, a mobile device 104 is a wireless phone suchas a mobile or cellular phone. By way of example, mobile device 104 maybe a smartphone (e.g., the iPhone or iPhone 3G manufactured by AppleInc. of Cupertino, Calif., the BlackBerry manufactured by Research inMotion (RIM), the G1 based on the Android operating system, or SamsungBlackJack based on the Windows Mobile operating system), feature phone,basic cellular phone, personal digital assistant, or other multimediadevice. Additionally, mobile device 104 may be affiliated with andsupported by any suitable carrier or network service provider such as,by way of example, Sprint PCS, T-Mobile, Verizon, AT&T, or othersuitable carrier.

FIG. 3 shows a schematic representation of the main components of anexample mobile device 104, according to various particular embodiments,which is adapted for use in connection with a GSM network or any othermobile telephone network as described above, and which may also beconfigured to meet the wireless application protocol specification(WAP). Mobile device 104 generally includes a controller 304 which maycomprise a microcontroller or one or more processors configured toexecute instructions and to carry out operations associated with mobiledevice 104. In various embodiments, controller 304 may be implemented asa single-chip, multiple chips and/or other electrical componentsincluding one or more integrated circuits and printed circuit boards.Controller 304 may optionally contain a cache memory unit for temporarylocal storage of instructions, data, or computer addresses. By way ofexample, using instructions retrieved from memory, controller 304 maycontrol the reception and manipulation of input and output data betweencomponents of mobile device 104.

Controller 304 together with a suitable operating system may operate toexecute instructions in the form of computer code and produce and usedata. By way of example and not by way of limitation, the operatingsystem may be Windows-based, Mac-based, or Unix or Linux-based, orSymbian-based, among other suitable operating systems. The operatingsystem, other computer code (including control client 308 describedbelow) and/or data may be physically stored within a memory block 306that is operatively coupled to controller 304.

Memory block 306 encompasses one or more storage mediums and generallyprovides a place to store computer code (e.g., software and/or firmware)and data that are used by mobile device 104. By way of example, memoryblock 306 may include various tangible computer-readable storage mediaincluding Read-Only Memory (ROM) and/or Random-Access Memory (RAM). Asis well known in the art, ROM acts to transfer data and instructionsunidirectionally to controller 304, and RAM is used typically totransfer data and instructions in a bi-directional manner. Memory block306 may also include one or more fixed storage devices in the form of,by way of example, solid-state hard disk drives (HDDs), among othersuitable forms of memory coupled bi-directionally to controller 304.Information may also reside on a removable storage medium loaded into orinstalled in mobile device 104 when needed. By way of example, any of anumber of suitable memory cards may be loaded into mobile device 104 ona temporary or permanent basis. By way of example, mobile device 104 mayalso include a subscriber identification module (SIM) card 328 and a SIMcard reader 330.

Controller 304 is also generally coupled to a variety of interfaces suchas graphics control, video interface, input interface, output interface,and storage interface, and these interfaces in turn are coupled to theappropriate devices. Controller 304 is also coupled to a networkinterface 305 that allows mobile device 104, and particularly controller304, to be coupled to another computer (e.g., device management system102) or telecommunications network (e.g., network link 106 or enterprisenetwork 110). More particularly, network interface 305 generally allowscontroller 304 to receive information from network link 106, or mightoutput information to the network link in the course of performingvarious method steps described below. Communications may be sent to andfrom mobile device 104 via network interface 305. By way of example,incoming communications, such as a request or a response from anotherdevice (e.g., device management system 102), in the form of one or morepackets, may be received from network link 106 at network interface 305and stored in selected sections in memory block 306 for processing.Outgoing communications, such as a request or a response to anotherdevice (e.g., device management system 102), again in the form of one ormore packets, may also be stored in selected sections in memory 306 andsent out to network link 106 at network interface 305. Controller 304may access these communication packets stored in memory 306 forprocessing.

Electric signals (e.g., analog) may be produced by microphone 310 andfed to earpiece 312. Controller 304 may receive instruction signals fromkeypad 314 (which may include soft keys) and control the operation ofdisplay 316 (In alternate embodiments, keypad 314 may be implemented asa virtual keypad displayed on display 316). By way of example, display316 may incorporate liquid crystal display (LCD), light emitting diode(LED), Interferometric modulator display (IMOD), or any other suitabledisplay technology. Radio signals may be transmitted and received bymeans of an antenna 318 that may be connected through a radio interface320 to codec 322 configured to process signals under control ofcontroller 304. Thus, in use for speech, codec 322 may receive signals(e.g., analog) from microphone 310, digitize them into a form suitablefor transmission, and feed them to radio interface 320 for transmissionthrough antenna 318 to, for example, a public land mobile network(PLMN). Similarly, received signals may be fed to codec 322 so as toproduce signals (e.g., analog) which may be fed to ear piece 312. Mobiledevice 104 also generally includes a ringer (e.g., speaker) 324 and mayalso include light emitting diodes (LEDs) 326. In particularembodiments, mobile device 104 may be a dual mode phone having awireless local area network (WLAN) interface, Worldwide Interoperabilityfor Microwave Access (WiMAX) interface, and/or other wireless orphysical interfaces (such as BlueTooth® and USB). Additionally, mobiledevice 104 may be powered by a removable battery pack 332.

Mobile device 104 may also include one or more user input devices 334(other than keypad 314) that are operatively coupled to the controller304. Generally, input devices 334 are configured to transfer data,commands and responses from the outside world into mobile device 108. Byway of example, mobile device may include a joystick or directional pad.Input devices 334 may also include one or more hard buttons.

Display device 316 is generally configured to display a graphical userinterface (GUI) that provides an easy to use visual interface between auser of the mobile device 104 and the operating system or application(s)running on the mobile device. Generally, the GUI presents programs,files and operational options with graphical images. During operation,the user may select and activate various graphical images displayed onthe display 316 in order to initiate functions and tasks associatedtherewith.

In particular embodiments, each mobile device 104 includes a controlclient 308 that is configured to interact with the device managementsystem 102 via network link 106. Control client 308 may generally beimplemented as one or more software programs or applications stored in,by way of example, memory 306. Control client 308 is configured toreceive data, commands, and other messages from the device managementsystem 102 via network link 106, to synchronize the state of the mobiledevice 104 with a corresponding mobile device profile object stored at adevice management database (such as a Lightweight Directory AccessProtocol (LDAP) database or directory), and to selectively track andupload data over the network link to the device management system forlogging by the device management system, as will be described in detailbelow. The logged data may include particular files (e.g., documents,spreadsheets, pdfs, pictures, etc.) stored in the mobile device as wellparticular application usage data in the form of, by way of example,activity data (e.g., data regarding calls, messages, and email), contentdata (e.g., the text within the message or email body), and/or contextdata (e.g., timestamps and location data, etc.), as will be described inmore detail below. In various embodiments, the control client logsman-machine interface (MMI) data, file system commands, and other datacharacterizing usage of, and/or the actions performed on, the mobiledevice. Some or all of the log data is provided to the device managementapplication hosted on the device management system 102, which cansynchronize a device object stored at the database with that of themobile device, and vice versa.

In particular embodiments, device management system 102 is configured toselectively log data from each of the mobile devices 104 of anenterprise. More particularly, mobile device 104 may be configured toselectively track and/or log data and to upload this data to devicemanagement system 102 which, in turn, selectively logs or stores thedata. In particular embodiments, each mobile device 104 is firstregistered with the device management system 102 by creating and storinga device object for the mobile device within the device managementsystem 102. By way of example, an employee desiring to use a personallyowned mobile device 104 may indicate to management that he or shedesires to use the personally owned mobile device 104 with enterpriserelated services (e.g., email or access to an enterprise database) andneeds enterprise access. Alternately, an employee receiving a mobiledevice 104 under a corporate liable plan may receive an enterprise ownedmobile device 104 upon commencing employment or receiving a mobiledevice upgrade, by way of example. In particular embodiments,registering a mobile device 104 with the device management system 102includes creating and storing a device object in a database within orconnected with device management system 102. The device object may beimplemented as part of a data structure corresponding to the particularmobile device 104. By way of example, a particular device object mayinclude a device identifier that uniquely identifies the correspondingmobile device.

In particular embodiments, the database within or connected with devicemanagement system 102 stores resources associated with the mobiledevices 104. By way of example, each resource may store a particularfile, or generally a data structure, as well as corresponding metadata.Each mobile device 104 also stores (e.g., within memory 306) a number ofresources each storing a file or data structure and correspondingmetadata. In particular embodiments, when control client 308 determinesthat a particular file or other data structure (hereinafter referred toas “file”) has been newly stored, updated, or otherwise modified withinmobile device 104, control client 308 creates a hash for the particularfile and causes mobile device 104 to transmit the hash to devicemanagement system 102. Upon receipt of the hash, device managementsystem 102 determines if the particular file corresponding to the hash(and the file in the mobile device 104) is already stored in one of theresources stored within device management system 102. In particularembodiments, if device management system 102 determines that theresource already exists, the device management system 102 creates a newresource link to the resource and stores or otherwise associates the newresource link with the device object corresponding to the mobile device104.

In particular, various embodiments enable selective erasing, tagging,copying, moving, modifying, viewing, and/or other selective action on orof particular data stored in a particular registered mobile device ordesignated group of mobile devices via the device management system 102.

The device management system 102 may operate in connection with controlclients 308 to discover the applications installed on mobile devices104. Users may install applications on their respective mobile devices104 by accessing a web site directly on the mobile device for example. Acontrol client 308 may detect application installs and transmitnotifications of such events to device management system 102. In otherimplementations, control client 308 may transmit log data from whichapplication installs on one or more mobile devices 104 may be detected.In other implementations, control client 308 may periodically generate alist of applications installed on a management mobile device 104 andtransmit the list to device management system 102. With some mobileplatforms, control client 308 may obtain a list of installedapplications using published APIs supported by the operating systems ofthe mobile devices 104. More generally, a control client 308 may alsomonitor for events and/or log data that is relevant to a securityprofile of a mobile device 104. For example, control client 308 can beconfigured to report on Subscriber Identity Module (SIM) card changes onthe mobile device 104. Control client 308 may also report on large fileuploads to a memory card or a remote host, changes to the operatingsystem files or behavior, or other activities that may be relevant to asecurity profile.

FIG. 4 illustrates how control client functionality may be integratedwith mobile device 104. In particular embodiments, the control clientfunctionality may include a control client application 402 and one ormore control points inserted to monitor data traversing the interfacesof the mobile device 104. For example, a man-machine interface (MMI)control point 406 may be inserted into the driver stack of theman-machine interface 408 to log keystroke data. An application/filesystem control point 410 may be inserted to monitor and log applicationlevel and file system commands. Additionally, stack control point 414may be inserted in one or more network protocol stacks of the mobiledevice 104, while port control points 418 may be inserted at a differentlayer of the network protocol stack. In various embodiments, one or moreof the control points may be implemented as drivers that are installedin the appropriate driver stacks of the mobile device. In someimplementations, the control points may emulate the operation of higherlayer and/or lower layer drivers and pass data on to the lower or higherlayer native drivers. In some embodiments, a rule set may define whatdata is captured.

Control client application 402 may store the data collected by thecontrol points in one or more log files stored on a storage device ofthe mobile device. For example, control client application 402 may storefile system commands (such as open, save, delete, copy, rename, etc.) infile system log 344. Furthermore, control client application 402 maystore keystroke data in behavior log 452. Still further, control clientapplication 402 may store data relating to its own operation in controllog 440.

The control client application 402 can provide some of all of the datato device management system 102, which may update one or more dataobjects that are associated with the mobile device 104 in a database. Inthis manner, a central device management system 102 can, for example,maintain an accurate image of the data storage device(s) of the mobiledevice 104, including the applications installed and the files stored onthe mobile device. In various embodiments, control client application402 may operate to provide this data in real-time, intermittently duringperiods of non-activity (e.g., such as when the mobile device isinserted into a charging cradle), in addition to, or at, periodicintervals. Still further, the data may be provided to the devicemanagement system 102 during a synchronization operation between themobile device and the user's personal computer. In a particularembodiment, a synchronization utility hosted by the user's personalcomputer may be configured to transmit the data to the device managementsystem 102. In addition, the control client application 402 may operatein one to a plurality of modes based on a set of rules or policies.Furthermore, the control client application 402 may also apply a ruleset that determines what data is provided to the device managementsystem 102, and/or when such data is transmitted.

In particular embodiments, the control client application 402 and theremote management server 102 may establish encrypted connections. Forexample, Virtual Private Network (VPN) tunneling and encryption may beused to secure the connection. In a particular implementation, mobiledevice 104 may include port-based VPN functionality to encrypt theconnection between the control client application 402 and the remotemanagement server 102.

Although the device management system 102 has been described ascreating, storing, and accessing a mobile device profile object for eachmobile device 104, in further implementations, the device managementsystem 102 may maintain a virtual instance of the mobile devices 104,and interact with a control client application hosted on the physicalinstance of the mobile device to synchronize the state of the physicalinstance of the mobile device with the virtual instance of that mobiledevice. In one particular embodiment, the control client logsman-machine interface (MMI) data, file system commands, and other datacharacterizing usage of, and/or the actions performed on, the mobiledevice. Some or all of the log data is provided to the device managementsystem 102, which can synchronize the state of the virtual instance ofthe mobile device.

In particular embodiments, a virtual instance of a mobile (wirelesscapable) device is a running instantiation of the associated actualphysical mobile device (hereinafter also referred to as “physicalinstance”) that can execute or operate in a virtualized executionenvironment. For example, a server may host a virtual machine thatemulates the hardware (such as the microprocessor or controller) of themobile device, allowing a copy of the mobile device operating system(hereinafter also referred to as “virtual operating system”) to be run.Additionally, one or more applications (themselves or copies) installedon the actual mobile device can also run on the virtual operatingsystem. The virtual instance of the mobile device may also include allor a subset of the file system image of the mobile device, as well asdevice configuration and settings. In one embodiment, the logged usagedata transmitted from a control client 308 on the actual mobile devicecan be used to replay, using the virtual instance of the mobile device,the actions taken by a user on the actual mobile device for a desiredperiod of time. Still further, a device management server, in someimplementations, may support an interface that presents a rendered imageof the mobile device and activatable man-machine interface that allows auser to input commands to, and otherwise interact with, the actualmobile device or the virtual instance of the mobile device.

Maintaining a virtual instance of a mobile device at device managementsystem 102, or a server or database connected to the device managementsystem 102, facilitates a variety of configuration, management,troubleshooting and/or security functions. For example, the virtualinstance provides an administrator a detailed snapshot of the state ofthe mobile device. The virtual instance also allows an administrator toinstall a certificate on the virtual instance of the mobile device,without consuming computing resources of the physical instance of themobile device. Furthermore, the virtual instance also allows anadministrator to perform management operations, such as virus/malwarescans, application/image certification, etc., on the virtual instance ofthe mobile device, without consuming computing resources of the physicalinstance of the mobile device.

In various embodiments, mobile devices 104 may include device managementand/or data synchronization functionality. For example, mobile devices104 may support the Open Mobile Alliance (OMA) Device Management (DM)protocol, and/or the OMA Data Synchronization (DS) protocol. OMA DM is aprotocol specified by OMA for DM purposes, by the Device ManagementWorking Group and the Data Synchronization Working Group. One suchspecification is OMA DM version 1.2, which is incorporated by referenceherein. The OMA DM specification is designed for management of smallmobile devices such as, by way of example, mobile phones, mobile smartphones, PDAs and palm top computers. The device management maysupport 1) provisioning (configuration of the device (including firsttime use), enabling and disabling features); 2) configuration (allowingchanges to settings and parameters of the device); 3) software upgrades(providing for new software and/or bug fixes to be loaded on the device,including applications and system software); and 4) fault management(such as reporting errors from the device, querying about status ofdevice). The device management generally takes place by communicationbetween a server (which is managing the device) and the client (thedevice being managed). OMA DM is designed to support and utilize anynumber of data transports such as a) physically over both wireline(e.g., USB, RS-232) and wireless media (e.g., GSM, CDMA, Infrared,BlueTooth), and b) transport layers implemented over any of WSP (WAP),HTTP or OBEX or similar transports. The communication protocol isgenerally a request-response protocol. Authentication and challenge ofauthentication may be incorporated to ensure the server and client arecommunicating after proper validation. The communication may beinitiated by the OMA DM server, asynchronously, using any of a varietyof methods available such as, by way of example, a WAP Push or SMS. Oncethe communication is established between the server and client, asequence of messages may be exchanged to complete a given devicemanagement task. OMA DM provides for alerts, which are messages that mayoccur out of sequence, and may be initiated by either server or client.Such alerts may be used to handle errors, abnormal terminations, etc.

Using OMA DM or another suitable protocol, the control clientfunctionality discussed above can be installed on a mobile device. Forexample, a mobile device without the control client functionality can beprovisioned and configured as follows. In a preliminary step, anadministrator may create a management instance of the mobile device witha minimal configuration. The mobile device 104, in some implementations,may not be allowed access (or at least full access) to the enterprise'sinternal network, except for device registration and provisioning withthe device management system 102. Suitable identifying information mayinclude a device identifier, a user name, and the like. A user of themobile device may then be directed to connect to the device managementsystem 102 using, for example, a dial up connection, or a dataconnection with a WAP browser. The device management system 102, actingas an OMA DM server, may then interrogate the mobile device to learn oneor more attributes (such as model number, serial number, operatingsystem type and version, etc.), and provision and configure the mobiledevice. When the mobile device has been configured, the devicemanagement system 102 may further use the configuration and otherinformation related to the mobile device to complete installation of acontrol agent on the mobile device.

In further implementations, all access to the enterprises's internalnetwork may be denied until the mobile device 104 includes at least aninstalled control agent. For example, any attempt to access theenterprises's internal network without an installed control agent mayresult in denial of access and a prompt to connect to the devicemanagement system 102 directly for registration and provisioning. Assuch, the mobile device 104 may need to directly communicate with thedevice management system 102 using, for example, a dial up connection, adata connection with a WAP browser, or a separate VPN/SSL gateway.

In some implementations, even if the mobile device 104 includes aninstalled control agent, the mobile device 104 may still be deniedaccess (or at least full access) to the enterprise's internal network.For example, as is discussed further below, in order to implementadditional security measures, the mobile device 104 may be required tohave a certificate installed on the mobile device 104 before some (orall) access is permitted to the enterprises's internal network. In someimplementations, obtaining a certificate may be part of the registrationprocess.

Obtaining Certificates for a Mobile Device

Mobile devices 104 can be configured to access various enterprisenetwork services that are hosted by or on behalf of an enterprise. Forexample, with reference to FIG. 1, a given enterprise may include aMicrosoft Exchange Server 112 with Exchange ActiveSync functionality. Insome implementations, such enterprise network services may be accesseddirectly or through SSL/VPN/Firewall gateway 120. Mobile devices 104 mayalso host applications that are configured to access systems external tothe enterprise network 110. Various differences between mobile devicesand other computing systems (such as personal computers and laptops)present challenges to network administrators relative to networksecurity. Users of mobile devices, for example, typically have much morecontrol over the ability to install applications—even unauthorizedapplications. In addition, mobile devices communicate overcommunications channels, such as carrier networks, that an enterprisehas little to no control of. Accordingly, a network administrator maynot simply block a switch port to which a host raising security concernsis connected or to deny access to certain remote hosts.

In order to protect the enterprise network, some implementations mayprovide certificates to each of the mobile devices 104 before the mobiledevices 104 may be allowed to access the enterprise network. Thecertificates may include any suitable digital certificate for verifyingwhether a mobile device 104 is authorized to access an enterprisenetwork, such as X.509 certificates. In some implementations, the mobiledevice 104 may be denied access to the enterprise network until acertificate has been installed on the mobile device 104. For example,referring to FIG. 1, when the mobile device 104 attempts to access theenterprise network, the mobile device 104 may be interrogated (i.e.,such as by being required to prove that the mobile device 104 has aninstalled certificate) in order to determine whether the mobile device104 has a certificate installed. The mobile device 104 may beinterrogated by any suitable apparatus connected to the enterprisenetwork, or by any suitable program of instructions installed on theenterprise network.

If it is determined that the mobile device 104 does not have acertificate, the mobile device 104 may be denied access to some (or all)of the enterprise network. In some implementations, when the mobiledevice 104 is denied access to some portions of the enterprise network,the mobile device 104 may only be able to access the device managementsystem 102 in order to register with the device management system 102.Other than the access granted in order to register with the devicemanagement system 102, the mobile device 104 may be denied access to anyother portion of the enterprise network. In further implementations,when the mobile device 104 is denied access to all of the networkenterprise, the mobile device 104 may have to set up a encryptedseparate connection (i.e., such as through a SSL/VPN/Firewall gateway)with the device management system 102 in order to register the mobiledevice 104. As such, without a valid certificate, the mobile device 104may not be able to access the protected enterprise network services onthe enterprise network, such as the ActiveSync/Exchange server 112.

On the other hand, if it is determined that the mobile device 104 doesinclude an installed certificate that is still valid, the mobile device104 may be provided access to the enterprise network services.Therefore, requiring the mobile device 104 to have an installedcertificate that provides evidence of the mobile device 104'sauthorization to access the network enterprise may provide additionalsecurity to the network enterprise, despite the fact that the mobiledevices 104 cannot normally be controlled outside of the enterprisenetwork.

FIG. 5 provides a process flow for obtaining a certificate for a mobiledevice 104. In the implementation shown, the mobile device 104 isregistered with the device management system 102 (504). After the mobiledevice 104 is registered with the device management system 102, thedevice management system 102 negotiates with a certificate authority(CA) for a certificate for the mobile device 104 (508). In someimplementations, this negotiation occurs based on the device management102 imitating (or spoofing) the mobile device 104. In furtherimplementations, a Simple Certificate Enrollment Protocol (SCEP) may beused for this negotiation. In additional implementations, any othersuitable communication protocols may be used for the negotiation. Oncethe device management system 102 receives the certificate, the devicemanagement system 102 may identify a security state of the mobile device104 (512). In one implementation, the security state may include adetermination regarding whether or not the mobile device 104 isauthorized to have (or receive) the certificate (i.e., authorized toaccess the enterprise network). If the mobile device 104 is authorizedto have (or receive) the certificate, the certificate may be transmittedto the mobile device (516). As such, the mobile device 104 may installthe certificate and proceed to access the enterprise network services ofthe enterprise network. However, if the mobile device 104 is notauthorized to have (or receive) the certificate, the certificate may notbe transmitted to the mobile device 104. Accordingly, the mobile device104 may not access the enterprise network services of the enterprisenetwork.

As is discussed above, the device management system 102 (and not themobile device 104) negotiates with the certificate authority in order toobtain a certificate for the mobile device 104. Thus, the mobile device104 does not need to have the capability of communicating with thecertificate authority. Accordingly, if a particular protocol is neededin order to communicate with the certificate authority, such as SCEP,the mobile device 104 does not need to have a SCEP client and/or thecapability of communicating using such a protocol. Additionally, themobile device 104 is also prevented from contacting the certificateauthority—thereby preventing the process of obtaining a certificate frombeing mishandled by an inexperienced mobile device user.

In some implementations, the device management system 102 negotiateswith the certificate authority using SCEP. SCEP is a public keyinfrastructure (PKI) communication protocol which leverages existingtechnology by using PKCS#7 and PKCS#10 over Hypertext Transfer Protocol(HTTP). Additional information regarding SCEP may be found in theInternet Engineering Task Force Internet-Draft entitled “Cisco Systems'Simple Certificate Enrollment Protocol draft-nourse-scep-20” and datedNov. 30, 2009, which is incorporated herein by reference. According tocertain implementations, the device management system 102 may negotiatewith the certificate authority using SCEP by first imitating the mobiledevice 104. For example, the device management system 102 may imitatethe mobile device 104 by generating a private key and a public key forthe mobile device 104. In such an example, the device management system102 may use the mobile device profile object in order to generate thekeys for the mobile device 104. Once the private key and public key forthe mobile device 104 have been generated by the device managementsystem 102, the private key and the public key may be transmitted to thecertificate authority according to both PKCS#10 and PKCS#7 in order torequest a certificate for the mobile device 104. In someimplementations, this request for a certificate may further include thedistinguished name of the mobile device 104, a challenge passwordattribute, and any other suitable information. After receiving thecertificate request, the certificate authority may transmit thecertificate back to the device management system 102. In someimplementations, this response from the certificate authority mayinclude the certificate authority's public key, the certificateauthority's name, and a serial number. In some implementations, thisnegotiation process may occur through a web or HTML/HTTP-basedinterface. Negotiation with the certificate authority may end once thedevice management system 102 obtains the certificate for the mobiledevice 104.

After the device management system 102 receives the certificate for themobile device 104, the certificate may be transmitted to the mobiledevice 104 for installation by the control client 308. In someimplementations, the device management system 102 may decrypt thecertificate prior to transmitting the certificate to the mobile device104. In other implementations, the device management system 102 maytransmit the encrypted certificate to the mobile device 104, along withthe private key and/or public key needed for the decryption. Inparticular implementations, the device management system 102 may cachethe certificate, private key, and public key before transmitting one ormore of these to the mobile device 104. In such implementations, thedevice management system 102 may transmit the certificate, private key,and/or public key to the mobile device 104 more than once in order toenable different services for the mobile device 104. In otherimplementations, the device management system 102 may not cache thecertificate, private key, and public key before transmitting one or moreof these to the mobile device 104.

In further implementations, prior to transmitting the certificate to themobile device 104, the device management system 102 may access adatabase to identify a security state of the mobile device. For example,each mobile device profile object may include information regarding asecurity state of the mobile device 104. This security state may includea determination regarding whether or not the mobile device 104 isauthorized to have (or receive) the certificate (i.e., authorized toaccess the enterprise network). In one implementation, thisdetermination may be made by the device management system 102. Themobile device 104 may not be authorized to have (or receive) thecertificate if, for example, the mobile device 104 includes a bannedapplication, if the mobile device 104 has a different SIM card than waspreviously recorded in the profile (such as an unknown SIM card), or ifthe mobile device profile object indicates any other information thatmay prevent authorization (such as information regarding whether themobile device 104 has performed any other banned processes).

In some implementations, the device management system 102 may onlytransmit the certificate to the mobile device 104 if the mobile device104 is authorized to have (or receive) the certificate. For example,prior to transmitting the certificate to the mobile device 104, thedevice management system 102 may access the mobile device profile objectin the database in order to receive an indication regarding the securitystate (i.e., whether or not the mobile device 104 is authorized to have(or receive) the certificate) of the mobile device 104. In suchimplementations, allowing the mobile device 104 to access the enterprisenetwork under such circumstances may be an unacceptable security risk.As such, the device management system 102 may not transmit thecertificate to the mobile device 104, rendering the mobile device 104unable to access the enterprise network and the enterprise networkservices.

One the other hand, if the security state indicates that the mobiledevice 104 is authorized to have (or receive) the certificate, thecertificate may be transmitted to the mobile device 104. Once the mobiledevice 104 receives the certificate, it may be installed on the mobiledevice 104. This installation enables the mobile device 104 to accessthe enterprise network and the enterprise network services.

Although the device management system 102 has been described asaccessing the security state of the mobile device 104 prior totransmitting the certificate, the security state may be accessed at anysuitable time. For example, the device management system 102 may accessthe security state prior to negotiating with the certificate authority.As such, if the security state indicates that the mobile device 104 isnot authorized to have (or receive) a certificate, the device managementsystem 102 may not even begin the process of obtaining a certificate forthe mobile device 104.

Managing Certificates

In some implementations, even after the mobile device 104 has receivedthe certificate, the device management 104 may continue to monitor themobile device 104's mobile device profile object in order to determinewhether the certificate should be revoked, rendered invalid, or notrenewed for later use. For example, the device management system 102 mayrevoke, invalidate, or not renew the installed certificate if it isdetermined that the mobile device 104 has installed a banned (orblacklisted) application, changed its SIM card, or performed any otherbanned process.

In particular implementations, the device management system 102 mayrevoke a certificate by transmitting various commands to the controlclient 308, causing the mobile device 104 to uninstall the certificateand transmit it back to the device management system 102. Once acertificate has been revoked, the device management system 102 mayrefuse to give the certificate back to the mobile device 104 (or refuseto obtain a new certificate for the mobile device 104) until it has beendetermined that the mobile device 104 is once again authorized to havethe certificate.

In some implementations, the device management system 102 may render themobile device 104's certificate invalid. For example, the devicemanagement system 102 may signal the security state of a mobile device104 to the enterprise network services (e.g., email servers, SSL/VPNServers, and other applications), which may then admit or deny access tothe mobile device 104. In one implementation, the device managementsystem 102 may be configured to set one or more security profile valuesin a data object associated with the mobile device 104. These values canbe distilled down to one Boolean value, such as an accept or admit(True/False) value. An enterprise application may be configured toaccess this parameter value when deciding whether to accept or rejectthe requests or other messages of the mobile device 104. In otherimplementations, the mobile device management system 102 may transmitblacklists or whitelists to various enterprise applications. These listscan be consulted by an exchange server 112, an SSL/VPN gateway 120and/or an application server 114, for example, when deciding whether toaccept or reject the requests or other messages of the mobile device104. In this manner, the mobile device 104 may be prevented fromaccessing the network enterprise services despite having an installedcertificate. Other implementations are possible. For example, mobiledevice management system 102 may maintain a variety of attribute valuesfor mobile device 104. A given application can be configured via a setof APIs to access one to a combination of these attributes when decidingto accept/reject access to a mobile device 104.

In further implementations, the device management system 102 may conductvarious other operations when the device management system 102determines that the mobile device 104 has performed unauthorized actionsor that the mobile device 104 is no longer authorized to access theenterprise network. For example, if an application is unauthorized, butdoes not present security issues, the device management system 102 maybe configured to transmit a notification or warning to the user of themobile device 104 that the application is unauthorized and, therefore,will not be supported by the enterprise's information technology (IT)department. As another example, instead of just revoking, invalidating,or not renewing a certificate, the device management system 102 maycause the entire storage device of the mobile device 104 to be wiped. Insuch an example, a wipe command may be transmitted to the control client308 hosted on the mobile device 104, which causes the entire storagedevice to be erased. This wipe command may be used if a known virus orother malicious application is detected, if a banned application isdetected, if the SIM card has been changed, or for any other suitablereason.

As is discussed above, the device management system 102 may enactvarious procedures if the mobile device 104 is determined to beunauthorized to access the enterprise network. In furtherimplementations, the device management system 102 may also prevent amobile device 104 from performing certain actions that may result in themobile device 104 becoming unauthorized. For example, in someimplementations, mobile device management system 102 can operate inconnection with control clients 308 installed on mobile devices 104 toblock an application from launching—that is, prevent it from beingstarted. As such, the device management system 102 may prevent thelaunching of any banned application.

As a further example, if the mobile device 104 has received acertificate from the device management system 102, the device managementsystem 104 may manage the mobile device 104 in order to prevent themobile device 104 from installing certain applications. For example, acontrol client 308 may detect an attempt to install an application, andtransmit information regarding the application to the device managementsystem 102. If the application is unauthorized (i.e., such as being abanned application), the device management system 102 may instruct thecontrol client 308 to prevent the application from being installed onthe mobile device 104.

Mobile Device Profile Objects

As discussed above, device management system 102 may maintain or accessmobile device profile objects for corresponding mobile devices 104 thathave been registered. In one implementation, the mobile device profileobject may be stored by the device management system 102 in a directoryserver 118, such as, for example, a LDAP directory. As such, in order toaccess the mobile device profile object, the device management system102 may request that the mobile device profile object be transmittedfrom the LDAP directory to the device management system 102. Mobiledevice profile information may include the make and model of the mobiledevice, an identifier of the operating system and version installed onthe mobile device, serial numbers, and Media Access Control (MAC)address (or other unique identifiers associated with one or morecommunications interfaces of the mobile device). Mobile device profileinformation may also include pointers to log data received from acontrol client 308 installed on a mobile device 104. Mobile deviceprofile information may further include an image of the file systemmaintained on the mobile device 104, such as all applications andapplication files stored on the mobile device 104. This information maybe made available to both users and network administrators for variouspurposes. In a further implementation where a virtual instance of eachmobile device 104 is being run, the device management system 102 mayaccess any needed information by accessing the virtual instance of themobile device running on any server, such as the directory server 118.

The device management system 102 may imitate the mobile device 104 basedon information in the mobile device profile objects. In someimplementations, the imitation of the mobile device 104 may be based onthe following information included in the mobile device profile objects:

-   -   Name—brief text that identifies the mobile device 104's SCEP        settings    -   Description—additional text that clarifies the purpose of the        mobile device 104's SCEP settings.    -   URL—the address of the certificate authority    -   Subject—an X.500 name represented as an array of OID and value    -   Challenge type—specifies the type of challenge to use for a        certificate revocation initiated by the mobile device 104    -   Challenge—a pre-shared secret the certificate authority can use        to identify the request or user    -   Challenge URL—the URL of the trust point defined for the        certificate authority    -   User name—the user name for the certificate authority    -   Password—the password for the certificate authority.    -   CN type—the format for the common name to be constructed for the        certificate    -   Key size—a key size (1024 or 2048)    -   Key usage—one or more acceptable uses of the key (i.e., signing        and/or encryption)    -   Fingerprint—further security verification.

In further implementations, the mobile device profile object may furtherinclude the following information for allowing access to variousenterprise network services, such as ActiveSync/Exchange:

-   -   Name—brief text that identifies this group of exchange settings    -   Description—additional text that clarifies the purpose of this        group of exchange setting    -   Server address—the address of the exchange server    -   Use SSL—a selection regarding the use of secure connections    -   Domain—the domain configured for the ActiveSync/Exchange server    -   ActiveSync user name—the user name to be used for ActiveSync        users    -   ActiveSync user email—the email address to be used for        ActiveSync users    -   ActiveSync password—the password to be used for ActiveSync users    -   Identity certificate—the SCEP entry created for supporting        ActiveSync/Exchange    -   Using sentry stand alone—this option facilitates matching        between the ActiveSync device and the device management system        102    -   Choose the items to synchronize—the outlook items to be        synchronized: context, calendar, email, text    -   Email Sync-Down-Load the past—the amount of email to synchronize        (may be selected from a drop down list)    -   ActiveSync settings—settings for the ActiveSync database    -   Peak times—the preferred synchronization approach for peak times    -   Off-peak times—the preferred synchronization approach for        off-peak times    -   Use above settings while roaming—whether to apply        synchronization preferences while roaming    -   Send/receive when clicking send—whether queued messages should        be sent and received whenever the user sends a message    -   Peak days—the days that should be considered peak days    -   Start time—the beginning of the peak period for all peak days    -   End time—the end of the peak period for all peak days    -   Apply to labels—the group of settings to be associated with the        selected labels    -   Search devices—the phone number or user ID to find smart phones        to which certain polices are applied to    -   Applied devices—the group of settings to be associated with the        selected smart phones.

In further implementations, the mobile device profile object may includeany other suitable information. In further implementations, thisinformation may be accessed from a virtual instance of a mobile device.In particular implementations, the foregoing information may be enteredby any suitable process. For example, the user of the mobile device 104may enter the information, and then the information may be transmittedto the device management system 102 by the control client 308 of themobile device 104. As another example, the information may be entered bya network administrator when the mobile device 104 is initially set upto be used on the enterprise network.

The present disclosure encompasses all changes, substitutions,variations, alterations, and modifications to the example embodimentsdescribed herein that a person having ordinary skill in the art wouldcomprehend. Similarly, where appropriate, the appended claims encompassall changes, substitutions, variations, alterations, and modificationsto the example embodiments described herein that a person havingordinary skill in the art would comprehend.

To aid the Patent Office and any readers of any patent issued on thisapplication and interpreting the claims appended hereto, Applicants wishto note that they do not intend any of the appended claims to invokeParagraph 6 of 35 U.S.C. § 112 as it exists on the date of filing hereofunless “means for” or “step for” are used in the particular claim.

What is claimed is:
 1. A system, comprising: a mobile device managementsystem that includes one or more processors; and a memory coupled to theprocessors and tangibly storing one or more instructions, the one ormore processors operable when executing the one or more instructions to:monitor a data object associated with a mobile device for one or morechanges; determine, based at least in part on the one or more changes,that the mobile device is not authorized to have a certificate that wasinstalled on the mobile device; and revoke the certificate that wasinstalled on the mobile device based at least in part on thedetermination that the mobile device is not authorized, wherein torevoke the certificate that was installed on the mobile device based atleast in part on the determination that the mobile device is notauthorized further includes to: transmit one or more commands to themobile device; and receive the certificate that was installed on themobile device from the mobile device.
 2. The system of claim 1, whereinthe one or more commands cause the mobile device to uninstall thecertificate.
 3. The system of claim 1, wherein the one or moreprocessors are further operable when executing the instructions to:after revoking the certificate, determine whether the mobile device isauthorized to have the certificate; and send the certificate back to themobile device upon determining the mobile device is authorized to havethe certificate.
 4. The system of claim 1, wherein the one or moreprocessors are further operable when executing the instructions to:after revoking the certificate, determine whether the mobile device isauthorized to have the certificate; and send a new certificate to themobile device upon determining the mobile device is authorized to havethe certificate.
 5. The system of claim 1, wherein the one or morechanges include installation of a banned application, changing a SIMcard, or performing a banned process.
 6. The system of claim 1, whereinthe certificate enables the mobile device to access one or moreenterprise network services.
 7. The system of claim 1, wherein thecertificate is a public key certificate.
 8. The system of claim 7,wherein the public key certificate is associated with an individual, amobile device, or both.
 9. A method, comprising: monitoring a dataobject associated with a mobile device for one or more changes;determining, based at least in part on the one or more changes, that themobile device is not authorized to have a certificate that was installedon the mobile device; and revoking the certificate that was installed onthe mobile device based at least in part on the determination that themobile device is not authorized, wherein revoking the certificate basedat least in part on the determination that the mobile device is notauthorized further includes: transmitting one or more commands to themobile device; and receiving the certificate that was installed on themobile device from the mobile device.
 10. The method of claim 9, whereinthe one or more commands cause the mobile device to uninstall thecertificate.
 11. The method of claim 9, further comprising: afterrevoking the certificate, determining whether the mobile device isauthorized to have the certificate; and sending the certificate back tothe mobile device upon determining the mobile device is authorized tohave the certificate.
 12. The method of claim 9, further comprising:after revoking the certificate, determining whether the mobile device isauthorized to have the certificate; and sending a new certificate to themobile device upon determining the mobile device is authorized to havethe certificate.
 13. The method of claim 9, wherein the one or morechanges include installation of a banned application, changing a SIMcard, or performing a banned process.
 14. The method of claim 9, whereinthe certificate enables the mobile device to access one or moreenterprise network services.
 15. One or more computer-readable, tangibleand non-transitory storage media encoding software that is operable whenexecuted to cause a mobile device management system to perform the stepsof: monitoring a data object associated with a mobile device for one ormore changes; determining, based at least in part on the one or morechanges, that the mobile device is not authorized to have a certificatethat was installed on the mobile device; and revoking the certificatethat was installed on the mobile device based at least in part on thedetermination that the mobile device is not authorized, wherein revokingthe certificate based at least in part on the determination that themobile device is not authorized further includes: transmitting one ormore commands to the mobile device; and receiving the certificate thatwas installed on the mobile device from the mobile device.
 16. The mediaof claim 15, wherein the one or more commands cause the mobile device touninstall the certificate.
 17. The media of claim 15, wherein thecertificate enables the mobile device to access one or more enterprisenetwork services.
 18. The system of claim 1, wherein the one or moreprocessors are further operable when executing the one or moreinstructions to update a data object associated with the mobile device,wherein an enterprise application provides access to the mobile devicebased on the data object.
 19. The system of claim 18, wherein the dataobject is updated prior to receiving the certificate that was installedon the mobile device and after the certificate that was installed on themobile device is revoked, wherein the mobile device is prevented fromaccessing the enterprise application despite having the certificate thatwas installed on the mobile device.